Unallocated numbers
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For whatever reason, some road numbers in the United Kingdom and Ireland have never been allocated. In most cases, especially in the Scottish zones, this is because there were more numbers available than were required. Others are currently unallocated because they were previously in use and have not yet been reallocated.
Perhaps the most notable missing number - and certainly the most asked-about - is the M7 within Great Britain. This appears to be a glaring omission of an important number, but it occurs because of the Scottish motorway numbering system, which requires numbers to be selected according to the A-road that the motorway follows. No motorway follows the line of the A7, and therefore no M7 exists.
Below is a listing of numbers that are unallocated for either reason.
Great Britain
Never allocated
Motorways (1 and 2 digits)
- 2 zone: M21, M22, M24, M28, M29
- 3 zone: M33, M34, M35, M36, M37, M38, M39
- 4 zone: M43, M44, M46, M47
- 5 zone: M51
- 7 zone: M7, M70, M71, M72, M75, M76, M78, M79
- 8 zone: M84, M86, M87, M88, M89
- 9 zone: M93, M94, M95, M97, M98, M99
3-digit A roads
- 7 zone: A773, A774, A777, A782-799
- 9 zone: A992, A995, A996, A998, A999
3-digit B roads
- 1 zone: B147
- 2 zone: B246-249, B293-299
- 3 zone: B320, B328-340, B342-348, B391-399
- 4 zone: B417-424, B426-429, B431-438, B441-449, B492-499
- 5 zone: B527, B532-539, B541-549, B592-599
- 6 zone: B602, B604-629, B631-639, B642-644, B646-649, B696-699
3-digit motorways, 4-digit A roads, 4-digit B roads
There are many examples - too numerous to list.
Previously allocated
Motorways
Numbers appeared on the ground
Numbers that didn't appear on the ground (including unbuilt in italics)
- 1-zone: M12, M13, M14, M15, M16, M17, M19, M100, M110, M111
- 2-zone: M270, M272, M273, M274
- 3-zone: M30, M31
- 5-zone: M52, M59
- 6-zone: M64, M68, M600, M601, M650
- 8-zone: M81, M82, M83
3-digit A roads
- 1 zone: A108, A115, A150, A175
- 2 zone: A241, A263, A266, A276, A279, A294
- 3 zone: A344, A364, A398
- 4 zone: A434, A440, A455, A471, A492
- 5 zone: A524, A564, A568
- 6 zone: A604, A613, A622, A648, A668
- 7 zone: A715, A729, A731, A732, A733, A734, A740, A742, A744, A748, A750, A753, A754, A757, A758, A764, A765, A767, A769, A776, A778
- 8 zone: A802, A805, A825, A840, A842, A843, A845, A852, A853, A854, A856, A859, A860, A864, A869, A870, A871, A874, A881, A892, A895
- 9 zone: A906, A920, A925, A927, A931, A936, A943, A946, A951, A954, A958, A968, A973, A974, A976, A979, A983, A987, A988, A997
3-digit B roads
- 1 zone: B103, B107, B110, B114, B115, B116, B117, B123, B124, B128, B129, B130, B131, B132, B133, B141, B162, B163, B169, B171, B190, B196
- 2 zone: B200, B201, B225, B231, B233, B239, B241, B244, B252, B254, B257, B267, B268, B287, B292
- 3 zone: B301, B303, B307, B308, B309, B314, B315, B341, B354, B355, B356, B357, B359, B362, B366, B370, B371, B379
- 4 zone: B403, B407, B424, B457, B458, B459, B460, B463, B464, B468, B473, B475, B476, B479, B484, B492
- 5 zone: B503, B505, B508, B513, B516, B522, B523, B528, B529, B553, B554, B555, B557, B558, B559, B561, B563, B564, B566, B567, B577, B580, B583, B584, B588, B591
- 6 zone: B650, B654, B657, B665, B666, B673, B674, B675, B677, B678, B681, B685, B687, B688, B689
- 7 zone: B716, B728, B760, B770, B772
- 8 zone: B807, B809, B811, B813, B820, B831, B848, B850, B854, B856, B859, B860, B868, B889
- 9 zone: B904, B911, B926, B958, B963, B982, B984, B988, B989
4-digit A roads, 4-digit B roads
There are many examples - too numerous to list.
Republic of Ireland
Never allocated
National Primary Routes
- 3 series: N34, N35, N36, N37, N38, N39
- 4 series: N41, N42, N43, N44, N45, N46, N47, N48, N49
National Secondary Routes
- 8 series: N88, N89
- 9 series: N90, N91, N92, N93, N94, N95, N96, N97, N98, N99
Previously allocated